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@rive_gauche
some questions for you chris:
is your cold water incoming supply pipe 15mm / 22mm / other dia?
is the cold water incoming isolation valve (stopcock) fully open?
are there any section in-line isolation service valves? if so, are these fully open?
what is your perception of pressure and flow at the first cold tap after the stopcock (usually the kitchen sink tap)?
as rodabod proposed, carry out some timed volumetric measurements at various taps, both hot and cold then let us know the results
what is the btu / flow / pressure rating of your combi boiler?
when the equalization / cold water make up valve is opened to pressurize the boiler, what number does the little pressure gauge on the boiler go up to?